© 2020, SatService GmbH www.satnms.com ACU-RMU-NEC-DS-2020-02-21 1/2

sat-nms ACU-RMU-NEC - Rack Mount Unit Antenna Controller

The sat-nms ACU-RMU-NEC is a complete and compact 6RU 19” rack-mount chassis antenna controller with optional

high performance tracking. It can be used as a cost-efficient antenna position controller or as a full featured antenna

step-track system. The system is based on the sat-nms ACU-ODM

Outdoor Module and includes three motor-driver units. All interfaces

to the satellite ground station antenna are accessible via connectors

matching and compatible with connectors of NEC ACU-Connectors at

the rear panel of the 19” chassis, so that it is easy to be integrated.

The sat-nms ACU-RMU-NEC can not only be used to point your

antenna precisely to the satellite but also with the option to perform

highly accurate step-tracking, adaptive tracking including orbit

prediction.

The sat-nms ACU-RMU-NEC includes:

• Three independent and flexible motor-drive interfaces allowing

simultaneous driving of all 3 axes with 3-phase frequency inverters (Az. and El.) up to 3kW (larger power available

in other mechanical configurations) and solid state relays (Pol.)

• Direct Ethernet UDP Interface for sat-nms LBRX

Beacon Receiver

• Analog Voltage Interface for 3rd

party Beacon

Receivers

• Resolver analog Angle Detectors Interface

measuring Azimuth, Elevation and Polarization

• Optical SSI Interface high precision digital Angle

Detectors as Alternative

• Analog ADC Interface to measure the Voltage across a Precision Potentiometer also available

The sat-nms ACU-RMU-NEC Unit includes an integrated

web server and provides its operator interface via web

browser. The sat-nms ACU-RMU-NEC includes also http

and ftp for remote diagnosis and support. The system is

easy to maintain. All support can be performed remotely

and the interface to high-level MNC Systems is provided

via Ethernet, TCP/IP, SNMP and RS232.

Contact Information

SatService

Gesellschaft für Kommunikationssysteme mbH

Hardstrasse 9, D-78256 Steisslingen, Germany

Phone +49 7738 99791 10,

Fax +49 7738 99791 99

E-Mail sales@satservicegmbh.de

www.satnms.com, www.satservicegmbh.de

Key Features

• Web-based, user-friendly Operator Interface

• Operating via Front Panel Display and Keypad

• Step-track and adaptive Tracking

• Very compact 6RU 19” rack-mount Design

• Integrated 3-phase Frequency Inverters

• HTTP and SNMP for external MNC Interface

© 2020, SatService GmbH www.satnms.com ACU-RMU-NEC-DS-2020-02-21 2/2

Technical Specification

Positioning

Operational Modes sat-nms ACU-RMU-NEC Manual Mode, Positioner

Operational Modes sat-nms ACU-RMU-NEC-T Manual Mode, Positioner, Step Track, Adaptive Tracking, Program Track.

Position Encoding Resolver, Optical Digital SSI and Potentiometer, scalable per Axis

Quantization Error Resolver 16bit: 0.0055°

SSI: 13bit: 0.044°, 16bit: 0.0055°, 17bit: 0.0028°, 19bit: 0.0007°

Display Position Resolution 0.001°

Maximum Travel Rate of each Antenna Axis 1°/sec

Interfaces to Beacon Receivers sat-nms LBRX or analog Voltage Input for other Vendors Equipment

Analog Voltage Input 0 to 10V via SMA female Connector

Option Tracking Accuracy Encoder coupling and alignment error should not exceed 0.003° to achieve

specified tracking accuracy. The influence of antenna structure thermal error is

not considered.

In step-track Mode Better than 10% of Receive 3dB Beamwidth (RMS).

In adaptive tracking Mode Better than 5% of Receive 3dB Beamwidth (RMS).

Position Encoding 1 LSB of Resolver / digital Conversion

Operational Modes Manuel Mode, Step Track, Adaptive Tracking takes into account last days

history, Program Tracking based on time stamped file data

Number of Presets 99 storage of sat-nms ACU Configuration (including sat-nms LBRX Beacon

Receiver Settings)

System Interfaces

sat-nms MNC Interface 10-Base-T, via HTTP GET Requests, RS232 and SNMP

Operator Access With web browser

To sat-nms MNC and sat-nms ACU-IDU Ethernet RJ45

To 4 Limit Switches Opto-Coupler Input for Azimuth, Elevation and Polarization / HAN3E Female

Interlock and motors-off Switches Opto-Coupler Input / MIL-C-5015 20-27s

2 angular Detectors Resolver, SSI Input / MIL-C-5015 18-1s

Motor Driver Interface Via Opto-Coupler Inputs and Outputs: Motor on/off and direction, low and high

speed selection, reset driver, driver fault for frequency inverter, DC servos etc.

Motor Interface Harting HAN6E Female with Frequency Inverter up to 3kW (AZ/EL).

Power Supply Interface Harting HAN6E Male (3ph. Motor Power) / HAN3E Male (1ph. sat-nms ACU-ODM)

Electrical and Mechanical Specification, Environmental Conditions

Supply Voltage 380VAC Mains Voltage 3 phase / 230VAC Mains Voltage Single Phase

Power Consumption 100W + Motor Power

Temperature Range -10° to 50°C

Humidity Up to 90% non-condensing

Dimensions 19”, 6RU, 450x270x380 mm (WxHxD)